- the input cap is 22n on both sides- instead of 1s1588, this uses 1n914- output cap of the high-gain red side has an "H" painted on it, but is the same value 105 as on the yellow side.- the feedback loop cap on the yellow side ist a weird value. 505? The red side has the usual 101=100pF.

I haven't verified all of the resistors.

kot_v4_2018.png

feedback_cap_yellow_side.png

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So I traced the circuit and it's pretty much what we already know. The only differences are thus:

- the input cap is 22n on both sides- instead of 1s1588, this uses 1n914- output cap of the high-gain red side has an "H" painted on it, but is the same value 105 as on the yellow side. The IC also has and H painted on and the chip id sanded off.- the feedback loop cap on the yellow side ist a weird value. 505? The red side has the usual 101=100pF.- On the high-gain red side the gain resistor is 100k, on the yellow side it is 1k.

I think the last part is news, as this resistor was always assumed to be 10k and the gain pot changed for high-gain on DIY projects.

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Those magical diodes can be found again and my big question is do they really make a difference in this thing? I made a clone of this and still need to figure out the best settings with those dip switches LOL